Guard mydebug.h file.

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
(cherry picked from commit a4307635e1)

kdbg/mydebug.h

@@ -4,6 +4,9 @@
  * See the file COPYING in the toplevel directory of the source directory.
  */
 
+#ifndef MYTRACE_H
+#define MYTRACE_H
+
 #include <kdebug.h>
 #include <assert.h>
 
@@ -23,3 +26,5 @@
 #else
 # define TRACE(x) ((void)0)
 #endif
+
+#endif